Looks good! 4 of those would be 600 watts and about 32 amps of current in direct sunlight. Since you have an MPPT controller, wire the panels in series on the roof and run the wire in to the charge controller. This will decrease your power loss in the cable since instead of running 32 amps at 12 volt in the cable (which you would need a large cable for that), you would be running 8 amps at 48 volt so you could go with a lot smaller of a cable, like 10-12 gauge stranded wire.
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Alright, all four panels are now installed and going. I'll post pics in a few.
I went to Lowes last night and picked up two heavy duty 1 1/2" channels, some nuts, bolts, and washers to mount the panels to. This ran me $53 instead of $150 for a prefabricated mounting system.
This morning I went to the welding supply store and got 12' of heavy duty 1/0 welding cable and 16 cable lugs to wire up the battery bank. I also picked up 30' of #4 welding cable (equal to 8 gauge) to wire the panels.
Will write details after lunch
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